28 lines
605 B
C
28 lines
605 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* This code comes from arch/arm64/kernel/crash_dump.c
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* Created by: AKASHI Takahiro <takahiro.akashi@linaro.org>
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* Copyright (C) 2017 Linaro Limited
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*/
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#include <linux/crash_dump.h>
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#include <linux/io.h>
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#include <linux/uio.h>
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ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
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size_t csize, unsigned long offset)
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{
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void *vaddr;
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if (!csize)
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return 0;
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vaddr = memremap(__pfn_to_phys(pfn), PAGE_SIZE, MEMREMAP_WB);
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if (!vaddr)
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return -ENOMEM;
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csize = copy_to_iter(vaddr + offset, csize, iter);
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memunmap(vaddr);
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return csize;
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}
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